We have just been sorting out the shed and found most of a Hansetec construction set! I remember how much fun our 3 children had with it - much better than the other sets around. A sham e nobody makes this stuff anymore.

I have some Bilofix which I loved as a kid. I still use it on school to demonstrate sstructures and mechanisms such as levers and linkages. I have also made a couple of non official parts "in the style" eg bell cranks. The kids laugh that it was my favorite toy until they start using it - then they can't put It down. Lovely tactile pleasure!